Einstein-Cartan Theory (https://en.m.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory https://en.m.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theo...) introduc

Einstein-Cartan Theory (https://en.m.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory https://en.m.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theo...) introduces a torsion term to General Relativity’s field equations that is not incompatible with observations and provides both an avenue for explaining the cosmological constant (https://arxiv.org/abs/1607.01128 https://arxiv.org/abs/1607.01128) and “big bounce” motivation for the beginning of our current universal epoch (https://arxiv.org/abs/1512.06074 https://arxiv.org/abs/1512.06074).